Fix JSON serialization of PerformanceEntry subclasses

third_party/WebKit/Source/core/timing/PerformanceEntry.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 23 matching lines @@
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ScriptState;
 class ScriptValue;
+class V8ObjectBuilder;
 
 using PerformanceEntryType = unsigned char;
 using PerformanceEntryTypeMask = unsigned char;
 
 class CORE_EXPORT PerformanceEntry : public GarbageCollectedFinalized<PerformanceEntry>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     virtual ~PerformanceEntry();
 
     enum EntryType {
@@ skipping 24 matching lines @@
     {
         return a->startTime() < b->startTime();
     }
 
     static EntryType toEntryTypeEnum(const String& entryType);
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     PerformanceEntry(const String& name, const String& entryType, double startTime, double finishTime);
+    virtual void buildJSONValue(V8ObjectBuilder&) const;
 
 private:
     const String m_name;
     const String m_entryType;
     const double m_startTime;
     const double m_duration;
     const PerformanceEntryType m_entryTypeEnum;
 };
 
 } // namespace blink
 
 #endif // PerformanceEntry_h